Effects of microstructure on the magnetic properties of polycrystalline NiMn2O4 spinel oxides

被引：11
|
作者：
Freitas Cabral, A. J. [1 ]
Remedios, C. M. R. [2 ]
Gratens, X. [3 ]
Chitta, V. A. [3 ]
机构：
[1] Univ Fed Oeste Para, Santarem, PA, Brazil
[2] Univ Fed Para, Inst Ciencias Exatas & Nat, Belem, Para, Brazil
[3] Univ Sao Paulo, Inst Fis, Sao Paulo, SP, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2019年 / 469卷
基金：
巴西圣保罗研究基金会;
关键词：
Nickel manganite; Microstrain; Exchange bias; NICKEL MANGANITE; CATION DISTRIBUTION; SOL-GEL;
D O I：
10.1016/j.jmmm.2018.08.051
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Polycrystalline NiMn2O4 samples were synthesized by sol-gel method at 500 degrees C (S500), 700 degrees C (S700), and 800 degrees C (S800). The three samples were then structurally characterized by X-ray diffraction and Rietveld refinement. Results indicate that samples are single phase and crystallize in the Fd (3) over barm space group with spinel structure. Williamson-Hall analysis shows that samples present different lattice strains. NiMn2O4 compounds show the magnetic transition from ferrimagnetic to paramagnetic at nearly 100 K. Hysteresis loops measured at T = 1.7 K after cooling the samples under magnetic field are asymmetric along the field axis.
引用
收藏
页码：108 / 112
页数：5
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